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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2451de5e2f2726327c9b750c0145ad2930b2529ba3e495ea69466d7c8b431a4e' 
  AND token = 'XfUI+RaV/FWkvsm2J+1v+CJH0Xihpe1GnifLT7jqL8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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