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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3598e477e09dffb084af8030c18696f8181ec00eee11b712057bf544a7eb5136' 
  AND token = '7nf5IZKy3UC8L74ZnJ+j7kXOQmUIexeOJ985tciJ67s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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