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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90481c420b07bdd158ee1be76af4dfd5d5e38f10b4b711bfacc65b442e38cdba' 
  AND token = 'rwXQKUGLrQA0e0J0XD4aZ2u4nXH/lvqgwa1TrTMbBVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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