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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c933be13aca41b9821eda0a73cc597c39016f58b0c430fd2f4d395befbf1515b' 
  AND token = 'wbfEl3z6OHz25ddXhDFt2OyCvf5iCcKeyW6rKFAvL4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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