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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8132c6402f0e7121d2c823da754ead4f3420ae1b4e56633d4614397678b249e2' 
  AND token = 'REZKyOCihFn+/Hbyx0oRma0dVa/8WfIS7pF65d3zcKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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