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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd454b9b0ca0794eefb1b27c441b6db8dbc02f77d5d423d7c8965f841df3966b' 
  AND token = 'TlWswHunHWKK7S75/W+tx3QdwyBR4BwY0QGf6bXT7RA=' 
  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"
    }
  }
}