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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6da4538a3d0d6a6a5ca1333d20adaf8237827949670dfed7b3a5f728a4217131' 
  AND token = 'lD6k+d19t2B7LFzFOcuzjnN5XgvUiAx8wcEMMUxMX9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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