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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '459e6f5de9fd75e73fb5d4ff7b61cc125614d2339223e8146bb3ba7b71ccd9f3' 
  AND token = 'sp03OTyfmJu9ZWyFVfrqRBJjdC0QOevHQIbWkDVi3E0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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