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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '275dc4c541991c3c2547d3614f4ff2f2cd433f230efb12fdf4007c76e8ad4c52' 
  AND token = '1n88TOt5GHD8WmInHcZ7bIL+S41liK937kpYlxO3Ybo=' 
  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"
    }
  }
}