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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6424f1ffa276acd259ec314ecc7a8d2df90f7dfa60ba948644e955809a3ad265' 
  AND token = '1W87yXchExuKuUx/9RMY+f1yh+nirjZlqic+QKljrAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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