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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb94dfbd54c3f827e5aa655d5f9f00fd1924bbac5eae03874cfa52e1d139b78b' 
  AND token = '4slbD8Kin7zR6NbSdx5F41tOTHdR4E7e6R+yhG0+jko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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