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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5c9d590be4d3ab305d37d6de41a76d297d60f32584197e6df15c9d1c4a2d233' 
  AND token = '39RlONZe//wbJSjBdaupmqYrb1AJwrs4LKBYMRozcKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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