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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6aace40500359784e50cc3420c31d819138222a1a38d2ae5ae64a8f69f70e22a' 
  AND token = 'GKkD95Zt7F1efU+fGANFXy6XcG9K9jGMXu7ND/GTk4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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