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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ca378f9b590e869a27f6f363c5de69865cc48e332b7c89ed4b8ebe653a293ff' 
  AND token = '0RDraUajASJZNYN80axmAZRpjPI6Z6f3uNwSYshTU0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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