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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67228474c9a448e2c96ee9e80a0ccbd977deb2618b522737b7715c4a6c003990' 
  AND token = 'qerh66nnx5LZDb5VP9oAwY8/db+joN2iMkd41Ew1FIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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