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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0a7508878329efc05fb6f41c5d03d470d517f13c278e82161a60283c8b94710' 
  AND token = '3FxlWNr1G+O6Z80XVJpxdaBHb4eJftlnaxHDXJsEP6Q=' 
  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"
    }
  }
}