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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e71949300b53aa4e673dc64d637e2cebaeb3864f93416fd6d134f12b86ad12c' 
  AND token = 'BpLTTcUderQ5aHrWIPqn6Q9jmQcSMb6/ae4JP75IfSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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