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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71721106f8ce4777233a7ad924949dd85adf95b10c5dae078f2c7ba88e604646' 
  AND token = 'HkT+db4ZOMNJd2OaxdCV+zb0F+rW4k9xU26tPKuGv2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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