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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef2ebe1e76fd3fba880f8c97b976c74c234f10ce240194fe8bca2f70927985a6' 
  AND token = 'Y81ERA6YMOWyS3AgeUko9NiUJxQv4Y5XpWVn22uV4lA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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