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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e301dca6d595c5415b5617fae4655e1a72e9a8a3b940ac2a350cd14a16d9bc2' 
  AND token = '0V6Jc7G+4kWTiEjT+NbcBKXKNUeaF+r2xgmELe0fZ60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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