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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76cdad4777acf55845c79cd25164563b9051eeb2cc6793cf0a0ece5b210e23ca' 
  AND token = 'PFI6C4ENLz7eri3n0PJ4dCdlCfFmOib4Zkv0w6W0p3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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