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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c59eb4b85aff64387960fb429a5d486236735a576c30864d9c4768ee93dbe178' 
  AND token = 'zY+vXbxTk1mbME+xD/FBN58YpoLletTh+SwkgBaOke8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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