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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c598d76ff31f8f200cc9353bced190b68be6662db1bb40cc5fb2f95ff1f2726' 
  AND token = '1NedooJtbfKBUUbskDoi6mRLto28CoukNH6gVu/l69I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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