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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d02100bcfa6600137d6c2e9b7fef4954abacab9e72c94520c3d2891cbccd106' 
  AND token = 'c2LCHU4g/hlXg1u+7RNU77Bruxfubb30fzY/jvSEh5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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