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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1b84b5dd6650847956a671d503461762135b2b73ac0fc4b21429aa03adb8a00' 
  AND token = 'WkYzA42/OvyYPNTyLHT/oKogursnT723JgDxKO//Zb8=' 
  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"
    }
  }
}