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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab95b54b7a8da6171a694375631f9d0b3cf439a53d7c99044f175dd7ddecdc23' 
  AND token = 'Vke4f0TLLkLDoEG1NVK8eFJd0QD0ctHO9zuT/jPvZp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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