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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74593a6ca6f928c92b055f4f484e7ea62732661f0efc8b5168302b31fa717e6d' 
  AND token = 'fG/aLCtp/WARYESEjdb0oBI4w3MUS28L1KXYlJ9P7xE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}