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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2723171da73ea1f73cbb95dcb7d0e596109ae3d9a6f98998e03ab94ae7480553' 
  AND token = 'EDrs86DOjrYGKkww4es8f10BzRrvi4/l0TJTJoXAZxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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