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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66a6da432c0abfa5c053565aaaf0598b40cbe12479340179b1b3897695597d3e' 
  AND token = '9Oh/1DRg2DwpDbCiicbW9bMcvYD8Je22OVSikFrjoXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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