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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52d64646e6d0637aad65ccb62f02c72f4655d3fc90bfd3ecb0e9367a9718dbd4' 
  AND token = '7voDEA2NzASms3u3XhDD83WMhzYP3JdD+FMjvfmTGzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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