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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e50adf83d1b14eb49e69860f204f433ebd38827220c44c090840137a475cc50' 
  AND token = 'G+zw2+rmW3N0S6c2OIrx6rwJ9LPS/TE2+JuEqdCZNhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00329

JSON explain

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