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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9714723468f89022cb41d4bcbf2099a64a3cc1e21eef5fff0a5b2a60d6c6e7ca' 
  AND token = 'jGgl/l737yTbND7LMIizyP/xLdBVV5fXBXq/I0kgfuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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