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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83f276f29c930b3e0342a21a303e7235d078e106eecec1cb1e308a998a0369af' 
  AND token = 'UFj00IZwzuuV2t1fcElHxkZ9SVC9t7xeSP+ExmacbYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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