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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f259e88d5d0a5e17097b0286957c6a3d4c4b5c2c376e9d6827ad155b5cb13247' 
  AND token = 'GgRXm2NxW43T7fJpJ9ajzLemHvPGy0g8MCEnMeX4EaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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