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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ca34d5432fec7088e03f1a06762e87064cecd6072a1a96e89fa11efd2211407' 
  AND token = '25E7OSTR64rwtc/bpnlj2ncJNMD4L6NTP8MAUF18eW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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