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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f83b5044d5ccdbb0bc6f7a5d0fcd227ca9dbc234420a6c317f58219b60068f9e' 
  AND token = 'bswZXJDAitH4JdnUWExcHx845edFN5hk84Wh0xnJXv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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