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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a6ad0e673aa3e23cfa04d8f5328201de9bb130b0c3452af90644732c513b6ef' 
  AND token = 'cLs3ScWtOMWBSGPmBEkL6UluxQQrGUYnXS1PfK8UIsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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