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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a49db5c1e8d7ce87d9e59797ee1f092d89eecac5aecdb3d3a99e0866165924a' 
  AND token = 'imhQwUa7wz9+q/NICvIcd/td4+xfKrBKoa/G4daFY/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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