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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29115bba35934223872c75f08d8803577371a3954ef324985bdd33bb8a780e36' 
  AND token = 'NNidsUpx22QH19x4VSZAcT0aaWPxUARjiO+7jOJ/UMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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