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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71cc9e35714f3f682ed48804cf95421db066ad990d43a9bc0e3d23e1b1b66cff' 
  AND token = 'OGi9u/Z0LC/cKsbxsh1hIY4OQ9+krmv8XWITKDNI8+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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