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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75dc8aea8f777fdcf88b0e7ca20064dcc0b55bc0f349de978c0f18d5bbbb2598' 
  AND token = 'Lot+GlSXLKoLZ7Ccc4s4xNQhyq5WosZYQltUXfDNWGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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