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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00c1079fa0e3cefed431d78d59def9f526d6f272be8474029a089aade7441126' 
  AND token = 'O4nYIb9D2uBolh78g3dY15rFvAkPveTj4otlQONZcQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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