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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e4522016c6f6d334ceaf15ccaf2cd42056365ab0e194c11db03be28d698a0d6' 
  AND token = '7eRQLBhR0hN/kxYgkaSKlS8qvThMJkzYLq3e2C+heoE=' 
  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"
    }
  }
}