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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f45c3a480b9d3c1952938038db154b82ad60568e1cce6d6ff7b5f7dd73b6c43e' 
  AND token = 'KnGxlSF2EmWh7DOflQrjdoi1aEvs06G7DJbTKerYdT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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