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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31f3ad0d5a1f044dfdd7c6354caf024c7f20aa62bb261ac5adbbf79bd7f031e2' 
  AND token = 'lylKE8vOAYN2IXts9k0FKVHKRJsuk+E9DlpY5myZ6io=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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