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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a84178ae8a4e4ff4dfd9441c2b5b2d827c8f9fbbba42484c9417a4f961ccc3fe' 
  AND token = '82I2CQPIh63FBRdKYQvKSxeshRER78DVK6h3D0RL+aA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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