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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9aa7bad630d9a8aee80c73b664d28501ec788a14f5cb1c23df619a326cea7a6e' 
  AND token = 'VYqdBNIX5B4UwYT/xTFhfQuuOIo4GibiT5eUO+YmV3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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