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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92e0027c01a499e447eec934cb9fc3deb69a5fcdcd5920d77c93382d6d6b1eaa' 
  AND token = 'okb15S66YAdm2/6cZ6mBRjoWFSQG0HAlNK0cZLjrVCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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