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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa544c090ff536190fbb577e775d4b3ac0d03f22299632363ee2e5261355ac8c' 
  AND token = 'ddQbEp5larwi0bZ0oa20kXteZ3iEv++LlwwDD2zdNKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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