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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bde9b9065210b534729fe34e7bdba214ce6be601e44b65d4168dbe709d9e87de' 
  AND token = 'SCQAL3VFvUakMhX1YIMmipyZvBu0QYQ3WJJRbZ+oA1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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