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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e79a9bb773f61a15a7288b4d26ff8c7ba2ab1797fb473980ca535dc168bbf6b4' 
  AND token = 'PtsSOcbZErlkOpmXxV2n3KliM2LKZS3fRVy9G0m2Hws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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