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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c0717a9d103a7ea3a2625e39554d5c1831719b7d7b1570fce1818578bb02e73' 
  AND token = '/P0d/qI9OIBh2sO/wKWO8uPB188ulq2LZaEslY1LPJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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