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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dd31a826a6bcb3843867e7aa7a2be23d90415dc0ffe41eb76efda7c122e37cb' 
  AND token = '/ZPiVrGcaECQZbHZKaBDZcZR0PVMv1yB650yg7vI5bQ=' 
  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"
    }
  }
}