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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4c9a6b3ad019855cff68383440e9a1b2b0f68838286e2e95588387d9fc6e04e' 
  AND token = 'R739h28Qjfp56zsvOn1ZC/a6fgzpq/a63wVo6Td7ppM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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