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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dccee1bec307961277178e7abc249497a7998c7f67c80a2d9118403f32a3c8c7' 
  AND token = '5HIkjusFVFaUFoNRMq9ZPxzEW8qLGNeHnymKrzD9xeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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